Method of making brake drums



Oct-19, 1937. 4

J H. HUNT ET Al METHbD OF MAKING BRAKE DRUMS Filed Aug. 22, 1935 INVENTOR. J H4EOLZ7 HC/ Patented Oct. 19, 1937 METHOD OF llIAKING BRAKE DRUMS V J. Harold Hunt and Andrew S. Van Halteren,

Lansing, Mich assignors to Motor Wheel Corporation, lwichigan Lansing,. Mich., a corporation of Application August 22, 1935, Serial'No. 37,272

6 Claims.

This invention relates to brake'drums of the type wherein the brake ring and the brake drum web are separately formed and thereafter attachedto each other to form a composite drum.

Specifically the invention has to do with the method of manufacturing brake drums of this character to provide a novel and economical method of forming a brake drum ring and a novel means for attaching-the ring to the web.

The present application is a continuation in part of our earlier copending application Serial No. 551,682, filed July 18, 1931, entitled Brake drums, which resulted in the issuance on January 28, 1937 of Patent No. 2,069,071.

Illustrative examples of the invention are shown in the accompanying drawing, wherein: Figure 1 is a partial sectional view of a metal cylinder adapted to be cut to form a pair of identical brake drum rings;

Figure 2 is a partial sectional view of a brake drum showing one of the rings formed from the cylinder of Figure 1 attached to a brake drum web;

Figure 3 is a partial sectional view of a brake drum showing a modified means for attaching the ring of Figure 2 to a brake drum web;

Figure 4 is a partial sectional view of a modified form of metal cylinder adapted to be cut intermediate its edge to produce a pair of brake drum rings;

Figure 5 is a partial sectional view illustrating the manner in which a ring formed from the cylinder of Figure 4 may be attached to a brake drum web;

brake drum web;

Figure 9 is a partial sectional view of a brake drum illustrating a modified manner of attaching the brake drum ring of Figure '7 to a brake drum web; and

Figure 10 is a partial side view in elevation of the brake drum illustrated in Figure 8.

The metal cylinder shown in Figure l'is preferably formed from a strip of metal of suitable length by coiling the same and welding the ends thereof together.

The particular section shown in Figure 1 is preferably produced at the mill. I That isto say, the metal is formed'in strips at the mill with the ribs 10 and H and with the central groove [2 which provides an. annular zone of reduced thickness; a 7 5 After the cylinder has been formed as; just described it is severed midway between its edges along the dotted line H! to produce a pair of brake drum rings l5 (as shown in Figure 2 and Figure 3) having edge portion l 6 of reduced thick- 10 ness. Where it is desired to attach thegring T5 to a brake drum web I! as shown in Figure 2, the reduced edge portion N5 of ring I 5 iscut away at intervals to provide the integral projection l8. The brake drum web H is provided with cooper- 5 ating openings adjacent its periphery to receive the integral projection H3. The ring and web [1 are assembled with the projection i8 extending into the opening of. the web I! and with the peripheral portion E9 of web I! flanged over the 52.0 outer surface of ring I5. As shown'in'Figure 2 the ring and web H are permanently attached to each other as by welding at '20. If desired the welding may be dispensed with and the projection I8 formed of greater length whereby the 25 same may project through the cooperating opening in web ll. When this is done the free extremities of projection IB may then be enlarged or otherwise deformed -to provide the necessary meansfor permanently attaching the ring and 30 web together. V

The metal cylinder shown in Figure 4 differs from that shown in Figure 1 primarily in cross sectional configuration. Like the cylinder in Figure 1 it is preferably formed from stock as re- 35 ceived from the mill by coiling a strip of suitable length and welding the ends thereof together. Also like the cylinder in Figure 1 it is provided with a central annular zone 24 of reduced sec- H tion. a y l The cylinder shown in Figure' l is cut midway between its edges along dotted line 25 to produce a pair of brake drum rings 26 of the shape illustrated in Figure 6, each having areduced edge portion. The reduced edge portion of ring 26 is cut away at intervals to produce integral projection 27. A brake drum web 28 is provided having a plurality of openings formed adjacent its periphery'for the reception of integral projection 2?. sembled with projection 21 ofthe former extending into the opening of the latter and with the peripheral portion 29 of web 28 flanged over the outer surface of ring 26. The free extremities of projections 21' are enlar ed'as indicatedat 301155 The ring 26 and web 28 are asshown in Figu're the reduced edgelportion of ring 26 is bent over to form a radially extending attaching portion 3l;.

openings in flange 3! of the former. The free extremities of projections: 33 'a re enlarged as indicated at 34 to permanently attach the ring and v V r {eacliofjthe rings ha ving aperipheral attachin V portion; forming cooperating integral projections 'and'openingsinsaid attaching portions, and 'as-fl webtogether, ,7 i .7

I p '15 fI'he -cylinder shown in Figure 7, isypreferably i formed 'in' the manner described in connection lwith'the cylinders'shown in Figures lland 4."?In

this instance thecylinder?isgprovided Iwitlican annulargrocve of substantial 'depth' midway bea,

" tween its.-'edges, the rnaterial forming-this groove V being,,of 'rducedfthickns W 3'l wshown in FiguresBrand9,.respectively.

ingia reducededge iportiomf This edge portion asshown in' Figure 811s bentradially inwardly to 530 forrnj a? substantial radiallyextending attaching 7 portion; 38. The portion 38 is provided with :a 'plurality'of spaced openings forthe reception'of 7 projections' carried by a brake drum: web; As -i shown in Figure' 8 a brake d um web 39VVis pro- 35 vided with integral projections: 40 at its :periph- 7 Very. The ring 36 and ,webp'39r are assembledwith the projections I407 of, the latter extending, into 7 the" openings formed in the, flange 38 of the l'ei'ormer. 'IThe free extremities: Qfprojecti n 38 are N 40 ;enlarged as indicated 'at'14l [topennanently at-p tach; the ring to the webi Figure 10 {showsa rear r to form substantially radially extending attachview in elevation of the drum, of Figure 8."

' A modifie'd method *of attaching rings formed 7 from thecylinder of Figure '7 toa web is illus V 1 5 trated in Figure 9; Inthis formpf attachment thereduced: edge portion of ring 31 is cut, away to provide a plurality of integral projections",

originally having the shape shown by the dotted. line s. A'brake drum web 43is; provided'having' 5 spaced openings formedtherein adjacent its p eriphery for the reception of projections '42. The 7 ring 31 and Web'43 are assembled with the proi jections fl of the former extending into the said in Figure 9 to permanently attaeh'th-g ring ,60 the web. Y 1 7 i From the. foregoingdescription it will be at- V parent'that the present "invention provides a ;novel method of forming brake drum rings-ar d novel means for attaching such a ring to a brake I 65 drur'n' web; By the provision of the doublering P havingacentral annular zone of reduced thick- 1" "nesslit, is' possible to form a pair of identical brake irings each having, an edge portion of re 7 ,duced thicknessgjThis is advantageousfsince. it: 70 not only effects'a saving ofrhaterialgbutalsm V facilitates the deformation of s uch e dge portion .to produce various forms of attachingportions utilized infastening the ring to the brake drum awebn "T A :75 While only selected embodiments of the invenr This portion is then 5 provided with" suitable spaced openingsqfor :the t reception of projections carried 'by'abrake'drum'" 'web; Injithis fdrrryth'e -ring is'attachedtoaa web 7 or 32 having integra1 peripheral projections 33. 7 Ring and web 32-are assembled'fwitlijthe 10 projections '33' of the latter extendinginto the; i

of'reduced thicknesabnding said edge portion" ofeach ring to forman attaching portion of re .ings whereby to produce a pair of identical-brake '2 'I'hemethod of manufacturing brake drums v ''which comprises providing 'a,metaljcylinder-gof r a central; annular fzone o-f jreduced thickness; 7 severing the cylinder'in said 'zoneto produce a r 7 pair of'brake ring sfeaich'having'an edge, portion :of. reduced thickness, bending said edgeportions out of their originalplane; forming apluraHtyc V of spaced'integral projectionsyon each, edge por y gw hiQhl subsequentlytakethe -form of;rings 36 and Afterthe, cylinder inFigure'flr'hasibeenifiut alongj thegdotted line a ring jisprovided have with the projections of the latter exending into theopeningsrof the former whereby to produce Weclaim; V r -11: Li Themethod of manufacturing brake drums Iwhich comprises providing a metalcylinderhav 7 ing a central annularzoneof'reduced'thickness,"

severing the cylinder in s'aidlz one to produce a pair of brake rings; each having an edge portion duced thickness'providing a bralge drum w eb for sembling the rings'andwebs with the integral 7 projections extending into the cooperating open-7' tion, rproviding a 'circular brake drum, Web for each ring', for-ming afpluralityof spaced openings 30 in the peripheral portion of the webs; and assembling the rings and webswith'the integral proi-h severing the. cylinderin; said zone toiproduce a pair of b'rakerings' each having an -.edge portion of reduced"thicknessbending said edge "portions in g portions, forming spacedopenings in saidiat-t taching portions, providingjacircular brake drum,

web for each of 'therings, forming spaced 'integral projections adjacent the periphery of each of the-webs, and assembling the rings and webs f a pair of identical brake drums.

'4! The method-of manufacturingbrake drurns a I which comprises providing :a' metal cylinder, severing the cylindermidway between its edges 'to producea pair ofbrake rings, bendingone edge of each'ring to form a substantially radial- &5 1 1y extending attaching p'orti on, forming, a plu-' Lrality of spaced openings insaid-attachingportio-ns, providing a circularbrake drum web ior 7 each of 'thevrgings, forminga plurality'ofspaced integral projections in the peripheral portion of the webs, and assembling the rings and webs with the projections. of the latter extending into-fthe openings of the former whereby to produce a pair, .7 of indenticalbrake drums. 1

p 5. The method of manui 'cturingbrakedrumsQ which comprises providing a cylindrical brake 1 ring having'an edge portion of reduced thick- :ness, bending said'edge portion to form a sub- "stantially radially extending vattaching portion, 7 forming spaced openings in the attachinggpor- H) tion, providing a circular brake drum web form ing spaced integral projections in, the peripheral 'portion 'of the ;web, 1 assembling the;ring and web with therprojection's of the latter extending through the openings in the former and deform- 5 5' ing the free extremities of said projections to lock the ring and web together.

6. The method of manufacturing brake drums which comprises providing a metal cylinder having a central annular zone of reduced thickness, severing the cylinder in said annular zone to produce a pair of brake rings each having an edge portion of reduced thickness, bending the reduced edge portion of each of the rings to produce a radial flange for engagement with a brake drum web, providing circular brake drum Webs having peripheral portions adapted for engagement with said reduced edge portions, and

attaching the peripheral portion of each web to 5 the reduced edge portion of one of the rings.

J. HAROLD HUNT. ANDREW S. VAN HALTEREN. 

